Machine Design
The objective of idler pulley in belt drive is to

Increase the wrap angle and belt tension
Decrease the tendency of belt to slip
Increase the power transmission capacity
All the above objectives

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Machine Design
In worm, gears, pitch lead angle is

None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation
The angle between the tangent to the pitch helix and an element of the cylinder

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